Unfortunately, his mnemonic would only work in the northern hemisphere, where the moon is observed in the southern sky with the right side of the moon sunward during the waxing phase and the left side sunward during the waning phase.

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The Economist can take solace that the original picture showing the waxing phase on the left side of the moon in Rio was indeed correct.

ECONOMIST: Letters

Those viewing outside the favoured zone were treated to a partial eclipse, in which the Moon just took a bite out of the side of the Sun's disc.

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Pink Floyd's The Dark Side of the Moon is to seal its place in history at the US Library of Congress as part of its National Recording Registry.

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For example, in 2011's Transformers: Dark Side of the Moon, Shia LaBeouf wears a T-shirt made by Chinese clothing maker Metersbonwe and, in one scene, a character drinks a carton of Shuhua milk made by dairy group Yili.

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His voting record in the Illinois legislature and U.S. Senate was on the other side of the moon.

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In the dark, under a starry sky and a waning moon, Todd and I drove up the side of Kimball Mountain, one of the last large peaks on the westernmost slope of the Rockies.

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The discovery would appear to resolve a longstanding mystery in planetary science: why the walnut-shaped Iapetus has a two-tone complexion, with one side of the moon significantly darker than the other.

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